P89V51RD2 Philips Semiconductors, P89V51RD2 Datasheet - Page 45

• Manufacturer Part Number: P89V51RD2
• Description: 8-bit 80C51 5 V low power 64 kB Flash microcontroller with 1 kB RAM
• Manufacturer: Philips Semiconductors

Philips Semiconductors
9397 750 12964
Product data
Fig 21. PCA interrupt system.
PCA TIMER/COUNTER
MODULE0
MODULE1
MODULE2
MODULE3
MODULE4
CMOD.0
The next two bits CAPN (CCAPMn.4) and CAPP (CCAPMn.5) determine the edge
that a capture input will be active on. The CAPN bit enables the negative edge, and
the CAPP bit enables the positive edge. If both bits are set both edges will be enabled
and a capture will occur for either transition.
The last bit in the register ECOM (CCAPMn.6) when set enables the comparator
function.
There are two additional registers associated with each of the PCA modules. They
are CCAPnH and CCAPnL and these are the registers that store the 16-bit count
when a capture occurs or a compare should occur. When a module is used in the
PWM mode these registers are used to control the duty cycle of the output.
Table 35:
Not bit addressable; Reset value: 00H
Bit
Symbol
ECF
CMOD - PCA counter mode register (address D9H) bit allocation
CIDL
7
CCAPMn.0
Rev. 01 — 01 March 2004
CF
WDTE
6
CR
ECCFn
-
5
-
CCF4
CCF3
4
-
8-bit microcontrollers with 80C51 core
CCF2
IEN0.6
3
-
EC
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
CCF1
CPS1
P89V51RD2
CCF0
2
IEN0.7
EA
CCON
(D8h)
CPS0
1
to
interrupt
priority
decoder
002aaa533
45 of 75
ECF
0